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    <title>Document</title>
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    <script>
        console.log(1&&2);//2
        console.log(0&&2);//0
        console.log((1,4,5));//，运算符，取等号右边的值
        a = b = c = 1;
        console.log(a, b, c);
        console.log(!1); //！运算的结果值为true 或 false

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